(named after Thomas Martens).
Named By: D. S. Berman, H. C. Maddin, A. C. Henrici, S. S. Sumida, D. Scott & R. R. Reisz - 2020.
Classification: Chordata, Synapsida, Caseasauria, Caseidae.
Species: M. bromackerensis (type).
Size: Roughly estimated about 73 centimetres long.
Known locations: Germany, Bromacker quarry - Tambach formation.
Time period: Early Permian.
Fossil representation: Partially preserved and articulated skeletons of at least four individuals.
is a genus of primitive caseidid synapsid that lived in Europe during
the early Permian. Martensius is known from both
adult and juvenile
specimens, and these show a development in changing dietary habits as
individual Martensius as they grew older. The
teeth of Martensius are
triangular like those of earlier more primitive relatives that were
more insectivorous. But younger Martensius had
more teeth in their
lower jaw than adults, at least thirty-one to the adult twenty-five
teeth. This would make the teeth dentition of juvenile Martensius
more similarly to the genus Eocasea,
a genus which is seen as more
insectivorous than herbivorous. This has led to speculation that
earlier in life Martensius were more carnivorous,
the extra protein from eating insects to promote body growth. Then in
later life Martensius may have become more
switching to a fully plant based diet.
- New primitive caseid (Synapsida, Caseasauria) from the early Permian of Germany. - Annals of Carnegie Museum 86(1):43-75. - D. S. Berman, H. C. Maddin, A. C. Henrici, S. S. Sumida, D. Scott & R. R. Reisz - 2020.